Monitoring system information on unlicensed band

Abstract

A receiving system information method includes monitoring a first system information (SI) monitoring window based on a first frequency. Receiving frequency pattern information on the first frequency, when a signal is not detected in the first SI monitoring window. Monitoring a second SI monitoring window on a second frequency based on the frequency pattern information.

The invention claimed is: 
     
       1. A method performed by a wireless device in a wireless communication, the method comprising:
 monitoring a first system information (SI) monitoring window based on a first frequency; 
 receiving frequency pattern information on the first frequency; 
 when a signal is not detected in the first SI monitoring window, monitoring a second SI monitoring window on a second frequency based on the frequency pattern information, 
 wherein the first SI monitoring window is related to a first group to which the UE belongs, and the second SI monitoring window is related to a second group. 
 
     
     
       2. The method of  claim 1 , wherein the first SI monitoring window and the second SI monitoring window are located in different time duration. 
     
     
       3. The method of  claim 1 , wherein a gap between the first SI monitoring window and the second SI monitoring window is smaller than a periodicity of the first SI monitoring window. 
     
     
       4. The method of  claim 1 , wherein the first frequency and the second frequency are on an unlicensed band. 
     
     
       5. The method of  claim 1 , wherein the frequency pattern information includes information on the second group of wireless devices. 
     
     
       6. The method of  claim 1 , wherein the signal is related to system information. 
     
     
       7. The method of  claim 1 , wherein it is determined that the signal is not detected in the first SI monitoring window, when a channel quality related to the first SI monitoring window is below a threshold. 
     
     
       8. The method of  claim 1 , wherein the frequency pattern information is transmitted via a dedicated message or a broadcast message. 
     
     
       9. The method of  claim 1 , further comprising:
 receiving the signal in the second SI monitoring window. 
 
     
     
       10. The method of  claim 1 , wherein the wireless device communicates with at least one of a mobile terminal, a network or autonomous vehicles other than the wireless device. 
     
     
       11. A wireless device in a wireless communication system, the wireless device comprising:
 a memory; 
 a transceiver; and 
 a processor, operably coupled to the memory and the transceiver, and configured to: 
 monitor a first system information (SI) monitoring window based on a first frequency; 
 control the transceiver to receive frequency pattern information on the first frequency; 
 when a signal is not detected in the first SI monitoring window, monitor a second SI monitoring window on a second frequency based on the frequency pattern information, 
 wherein the first SI monitoring window is related to a first group to which the UE belongs, and the second SI monitoring window is related to a second group. 
 
     
     
       12. The wireless device of  claim 11 , wherein the first SI monitoring window and the second SI monitoring window are located in different time duration. 
     
     
       13. The wireless device of  claim 11 , wherein a gap between the first SI monitoring window and the second SI monitoring window is smaller than a periodicity of the first SI monitoring window. 
     
     
       14. The wireless device of  claim 11 , wherein the first frequency and the second frequency are on an unlicensed band. 
     
     
       15. The wireless device of  claim 11 , wherein the frequency pattern information includes information on the second group of wireless devices.